Expanding mandrel assembly



Jan. 19, 1965 w. L. MASON EXPANDING MANDREL ASSEMBLY Filed May 6, 1965INVENTOR.

WlLLIAM L- MASON forward and effective, manner. plates an expandingmandrel assembly comprising in combination. a hollow, open-ended,cylindrical rubber sleeve 7 having raised flanges-at eachend'thereof. Apair ofcy-' R 3,166,335 Patented Jan. 19, 1965 nxrANnrNo MANDRELASSEMBLY William L. Mason, Pequea Township, Lancaster County,

Pa, assignor to Armstrong Cork Company, Lancaster,

corporation of Pennsylvania 7 Filed May 6, 1963, Ser. No."278,065 I 4Claims; (QL 2'79- -Z) 7 Pan, a

sleeve 1 and'the caps 4 and 5. Admission of air into the sealed chamber6 may be accomplished by a shaft 'lhis invention relates generally to anexpanding maridrel. assembly, and more particularly to an expanding.mandrel adapted to retain a bobbin. Still more particularly theinvention relates to an expanding mandrel used particularly as aitwisteron textile machinery in order that the bob-bin may be rapidly and easilyplaced on the mang tapered interior and must be forced onto} tapereddriving. shafts in order to prevent slippage of the bobbin duringrotation, Once the V bobbin has been forced on the shaft, it is oftendifiicult drel and removed therefrom. "The bobbins, now in use have a toremove. There is, therefore, a need for a device that It is the primaryobject of the present inventionj to supply such a device. It" is afurther object of the present adapter 7 having an air conduit 8 leading11011116 air outlet 9; The. shaft adapter 7 may then carry at the topthereof a screw seat 16 adapted to receive the [retaining screw 11 whichholds the top cap 4 in position against the shaft adapter 7. The shaftadapter 7,is afiixed to the supporting hollow shaft 12 which is mostconveniently :the shaft of an air motor, not shown, but the supportingshaft 12 may comprise any hollowshaft which is fixed or which is adaptedto rotate and thus turn'the assembly of the caps 4 and 5 and-the sleeve1.

The gaps 13 allow play'of theflanges 2 when the sleevelis in an expandedconditiomas shown in FIG. 2. Theover-all length of the sleeve-1 willgenerally run irom 1 inch to 2 inchesinlength, the thickness offtheflanges 2 will generally range from /8 to A inch and the i thickness ofthebody of thesleeve will range from $4 to i will allow easy andrapidremoval and installation' of a high-speed bobbin used to'wind upthreads and yarns on textile machinery.

invention to supply an expanding mandrel which, will quickly and tightlygrip a bobbin placed thereon and which will allow "ready release of thebobbinonce 'the mandrel isreturned to a nonexpanded condition.

These objects are achieved in" a surprisingly straight- The-inventioncontemlindrical supporting caps havingshoulders adapted to receive theflanges on thesl'eeve are mounted on the open ends ofthe sleeve to formairtight seals at the ends. -Means for admitting air under pressureinto" the sealed interiorof the sleeve is provided iii-order to causethe sleeve to expand and press against the interior of a bobbin.

Finally, there is preferably provided means} for rotating the assemblyof the caps and expanded sleeve with the bobbin thereon. i

The inventionwill be more readily understood by ref;

erence to the accompanying drawings, inwhich: l

FIG. 1 is a longitudinal section of'thejassembly of the invention, i

7 FIG. 2 showsthe assembly of FIG. 1 wherein the is in an expandedcondition, and

I ,FIG. 3 is an isomeric view of the sleeve itself.

Referring to the drawings, in which like parts havethe 2 same numbers,the rubber sleeve 1 has raised flanges 2lat I 5 inch. The sleeve andattendant flanges will be made of r ibber, natural or synthetic,preferably a cured rubber compounded with a suitable 'reinforcing'black,to allow repeated expansion andcontraction during the life of thesleeve. I .i

The caps 4 and 5, the shaft adapter 7,- and the motor shaft 12 may allbe fabricated of any convenient materials, preferably metalOrdinarysteel has been ,successfully used for these parts. i

I claim:' l-. An expanding mandrel assembly comprising in combination ahollow, open-ended, cylindrical rubber sleeve having raised externalflanges at each end thereof, a pair of supporting cylindrical capshaving shoulders thereon adapted to receive said flanges, said shouldershaving sufficient depth to form a gap between the outer. edges of saidflanges andtheinner corresponding surfaces of said shoulders to allowsaid flanges to bend outwardly in the axial direotion'during expansionof said sleeve, the caps being mounted on the open ends of said sleeveto form airtight seals thereon, and means for admitting air underpressure into the sealed interior of said sleeve to cause said sleeve toexpand, and supporting means for said caps and said expanded sleeve.

2. An assembly according to claim 1 in which said supporting means isadapted to rotate. "45,

3. An assembly according to claim 2 wherein said supporting means forrotating said caps and said expanded sleeve each end thereof. .Theflanges 2 are an integral'part of v the sleeve 1 and are mostconveniently constructed by removing a portion of the middle area ofthe'cylindrical .r sleeve 1; The'fianges Ziof the sleeve 1 are grippedbyare, shoulders 3 of the top cap 4 and the bottom cap 5 Thisarrangement forms the sealed chamber 6 bounded bythe sleeve comprisesthe shaft of an air motor.

4. An assembly according to claim 1 wherein one of .saidacaps issupported by a transverse shaft adapter concentric in said sleeve. l

References Cited in the file of this patent I UNITED STATES PATENTS1,367,808 Farrington Feb. 8,1921 2,490,472 Raske Dec..-6, 1949 2,583,117Piperoux -1 Ian. 22, 1952 2,671,297 Arms Mar. 9,1954 2,876,961

Cole Mar. 10, 1959

1. AN EXPANDING MANDREL ASSEMBLY COMPRISING IN COMBINATION A HOLLOW,OPEN-ENDED, CYLINDRICAL RUBBER SLEEVE HAVING RAISED EXTERNAL FLANGES ATEACH END THEREOF, A PAIR OF SUPPORTING CYLINDRICAL CAPS HAVING SHOULDERSTHEREON ADAPTED TO RECEIVE SAID FLANGES, SAID SHOULDERS HAVINGSUFFICIENT DEPTH TO FORM A GAP BETWEEN THE OUTER EDGES OF SAID FLANGESAND THE INNER CORRESPONDING SURFACES OF SAID SHOULDERS TO ALLOW SAIDFLANGES TO BEND OUTWARDLY IN THE AXIAL DIRECTION DURING EXPANSION OFSAID SLEEVE, THE CAPS BEING MOUNTED ON THE OPEN ENDS OF SAID SLEEVE TOFORM AIRTIGHT SEALS THEREON, AND MEANS FOR ADMITTING AIR UNDER PRESSUREINTO THE SEALED INTERIOR OF SAID SLEEVE TO CAUSE SAID SLEEVE TO EXPAND,AND SUPPORTING MEANS FOR SAID CAPS AND SAID EXPANDED SLEEVE.